document.write('
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  1. void setup() {
  2.  
  3. Serial.begin(9600);
  4. }
  5.  
  6. void loop() {
  7.  
  8. int mq7 = analogRead(1);
  9. Serial.println(mq7);
  10. delay(200);
  11.  
  12. }
');